Linux systems provide a lot of useful commands for reviewing network configuration and connections. Here’s a look at a few, including ifquery, ifup, ifdown and ifconfig.
You might now most of them, but most propably not all of them… so check out to learn the rest.
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Tomi Engdahl says:
More ways to examine network connections on Linux
https://www.networkworld.com/article/3233306/linux/more-ways-to-examine-network-connections-on-linux.html
Several commands can help you see what’s up with your network on Linux systems,